For -> EOS modification, have a look at what I have done..
It may be helpful to you too.
http://www.iceinspace.com.au/forum/s...anon+50mm+lens
http://www.iceinspace.com.au/forum/s...s+modification
This requires some machining to be done on adapter.. And some adjustment of focus stops on the lens itself (easy and reversible.. they are accessible from the front or after removal of rubber grip ring).
I have no experience with MD lenses, but I am sure it can be done.